1 files changed, 3 insertions, 1 deletions
diff --git a/Lib/abc.py b/Lib/abc.py
index d13a0de..9bdc36d 100644
--- a/Lib/abc.py
+++ b/Lib/abc.py
@@ -170,9 +170,11 @@ class ABCMeta(type):
         """Debug helper to print the ABC registry."""
         print("Class: %s.%s" % (cls.__module__, cls.__qualname__), file=file)
         print("Inv.counter: %s" % ABCMeta._abc_invalidation_counter, file=file)
-        for name in sorted(cls.__dict__.keys()):
+        for name in cls.__dict__:
             if name.startswith("_abc_"):
                 value = getattr(cls, name)
+                if isinstance(value, WeakSet):
+                    value = set(value)
                 print("%s: %r" % (name, value), file=file)
 
     def __instancecheck__(cls, instance):